Launch Ready cyber security Checklist for founder landing page: Ready for production traffic in marketplace products?.

Launch Ready cyber security Checklist for founder landing page: Ready for production traffic in marketplace products?

"Ready" does not mean "the page loads on my laptop." For a founder landing page in a marketplace product, ready means a stranger can hit the domain, trust the brand, submit their email or application, and not expose your stack, your users, or your revenue flow.

I would call it production-ready only if these are true:

• The domain resolves correctly with HTTPS enforced.
• Email deliverability is set up with SPF, DKIM, and DMARC passing.
• No secrets are exposed in the frontend, repo, logs, or build output.
• Cloudflare or equivalent edge protection is active with basic DDoS and bot filtering.
• Redirects, subdomains, and canonical URLs are clean.
• Monitoring is in place so you know about downtime before customers do.
• The page loads fast enough to avoid killing conversion. For a landing page, I want LCP under 2.5s on mobile and CLS under 0.1.
• There are no obvious auth bypasses, open admin endpoints, or public preview links that leak data.

For marketplace products, the risk is bigger than a normal brochure site. A bad launch can break onboarding trust, damage email reputation, leak admin access, trigger spam abuse, or waste paid traffic that should have converted.

Quick Scorecard

| Check | Pass criteria | Why it matters | What breaks if it fails | |---|---|---|---| | HTTPS enforced | All traffic redirects to HTTPS with valid SSL | Protects users and builds trust | Browser warnings, lower conversions, session risk | | DNS correct | Domain and subdomains point to the right targets | Prevents black holes and misroutes | Broken site, email failures, wrong environment exposed | | SPF/DKIM/DMARC passing | All three pass for sending domain | Protects deliverability and spoofing resistance | Emails land in spam or get rejected | | Secrets removed from client | Zero exposed API keys or private tokens | Stops account takeover and data abuse | Public key theft, bill shock, data exposure | | Cloudflare enabled | WAF/CDN/DDoS protection on critical routes | Reduces attack surface at launch | Bot abuse, downtime spikes, noisy traffic | | Redirects clean | One canonical URL per page and no loops | Preserves SEO and avoids confusion | Lost traffic, duplicate content, broken tracking | | Production env vars set | Correct env values in prod only | Prevents test data leakage | Wrong API targets, broken forms | | Monitoring active | Uptime alerts and error alerts configured | Shortens incident response time | You find outages from customers first | | Cache policy sane | Static assets cached properly; HTML not overcached if dynamic | Improves speed without stale content risk | Slow pages or stale deploys | | Access locked down | Admin panels protected by auth/IP rules where needed | Prevents casual compromise before scale-up hits | Unauthorized access to dashboards or CMS |

The Checks I Would Run First

1. Domain and SSL chain

Signal: The root domain loads on HTTPS only, with no mixed content warnings and no redirect loops.

Tool or method: I check DNS records first, then test `http` to `https` redirects across root domain and `www`, plus any subdomains used for auth or app flows. I also inspect the certificate chain in browser dev tools or with `curl -I`.

Fix path: Point A/AAAA/CNAME records correctly, install a valid certificate through Cloudflare or your host, then force one canonical URL. If there is a loop between `www` and non-`www`, I pick one version and make every other variant redirect there.

2. Secrets exposure audit

Signal: No API keys, private tokens, webhook secrets, service account JSON files, or internal endpoints are visible in source code shipped to the browser.

Tool or method: I scan the repo for `.env`, hardcoded keys, build artifacts, source maps exposing internals, and any secret-like strings. I also check browser network calls to make sure client-side code is not sending privileged credentials.

Fix path: Move all sensitive values into server-side environment variables or secret managers. Rotate anything already exposed immediately. If a key has been public even briefly, I treat it as compromised.

3. Email authentication setup

Signal: SPF passes exactly once per sending provider; DKIM signs outbound mail; DMARC is set with at least `p=none` during testing and then tightened after validation.

Tool or method: I use MXToolbox or similar DNS checks plus live test sends to Gmail and Outlook. I verify alignment between the visible From domain and authenticated sender domain.

Fix path: Add SPF records carefully so you do not exceed DNS lookup limits. Enable DKIM signing in your email provider. Publish DMARC with reporting first so you can see failures before enforcing quarantine or reject.

A minimal example looks like this:

v=spf1 include:_spf.google.com include:sendgrid.net -all

That is only an example. The real record must match your actual provider list exactly.

4. Cloudflare edge protection

Signal: Cloudflare is proxying the public hostname where it makes sense; WAF rules are active; rate limiting exists on forms if abuse is likely.

Tool or method: I review Cloudflare DNS status flags, firewall events, bot activity logs, and cache behavior. I also test whether origin IPs are hidden from public DNS where possible.

Fix path: Put the public site behind Cloudflare proxy mode for HTTP traffic. Lock down origin access so attackers cannot bypass the edge by hitting your server directly. Add basic WAF rules for common payloads and form abuse patterns.

5. Form submission security

Signal: Contact forms or waitlist forms reject malformed input safely and do not expose stack traces on failure.

Tool or method: I submit empty payloads, long payloads, HTML tags, script tags, repeated requests, invalid emails, and slow requests. I watch both frontend responses and backend logs.

Fix path: Validate input server-side every time. Rate limit submissions by IP plus fingerprint where appropriate. Return generic errors to users but log enough detail internally to debug without leaking internals.

6. Production deployment hygiene

Signal: Production uses production-only environment variables; debug mode is off; staging data cannot be reached from prod UI paths.

Tool or method: I compare deployed env settings against expected prod config and inspect build output for accidental test endpoints. Then I verify that analytics pixels load only on intended pages and that no admin route is publicly discoverable without auth.

Fix path: Separate staging from production at the DNS level if possible. Remove debug banners and preview URLs from public navigation. Confirm all webhooks point to production endpoints only after launch approval.

Red Flags That Need a Senior Engineer

If you see any of these five issues, I would stop DIYing and buy help instead of gambling on launch day:

1. You do not know where secrets live anymore. If keys were copied across Lovable layers, GitHub repos, Vercel env vars, Cloudflare Workers functions backends), there is usually no clean manual audit trail left.

2. Your domain has multiple versions working inconsistently. If `www`, apex domain `landing.yoursite.com`, preview URLs) all behave differently, you are one bad redirect away from broken SEO tracking and support tickets.

3. Email sends "work" but land in spam. This usually means SPF/DKIM/DMARC alignment issues that founders miss until leads stop replying.

4. The site depends on hidden backend logic you cannot explain. If you cannot tell me which requests are public versus authenticated, there may already be an authorization gap waiting to be exploited.

5. Your launch traffic will come from ads or partnerships. Paid traffic turns small technical mistakes into real money loss fast.

DIY Fixes You Can Do Today

Before contacting me at Launch Ready, you can reduce risk quickly with these five actions:

1. Turn on HTTPS enforcement everywhere. Make sure every URL redirects to one canonical secure version. Test root domain, `www`, mobile, desktop, old campaign links, subdomains, all of it.

2. Rotate any key you pasted into chat tools, frontend code, browser-local storage, shared docs, screenshots, or Git history. If you think it might have been exposed, assume it was exposed.

3. Check your DNS records against your actual providers. Remove stale A records, old MX entries, unused CNAMEs, parked domains, forgotten preview hosts), especially if they point at old vendors you no longer use.

4. Set up basic uptime monitoring now. Even a simple ping monitor plus alerting can save hours of blind downtime. Add checks for homepage availability, form submit success, SSL expiry, DNS resolution, and status page health if available).

5. Test email authentication before launch traffic starts. Send one message to Gmail, one to Outlook, one to a corporate inbox if possible). If either lands in spam, do not assume it will improve itself after launch.

Where Cyprian Takes Over

This is where my Launch Ready sprint maps directly to your failed checklist items:

| Failure area | What I fix | Deliverable | |---|---|---| | Domain chaos | Apex/www/subdomain cleanup plus redirects | Clean DNS map with one canonical route | | SSL gaps | Certificate install plus forced HTTPS | Valid SSL everywhere users land | | Email reputation issues | SPF/DKIM/DMARC setup validation | Passing authentication records | | Secret leaks / unsafe config | Env var cleanup plus secret rotation plan | Zero exposed secrets in deployed app | | Edge protection missing | Cloudflare setup with caching/WAF/DDoS settings | Safer public entry point | | Deployment uncertainty | Production deployment review and release handover | Verified prod build with rollback notes | | No monitoring coverage | Uptime monitoring plus alert routing setup || Alerts go to founder inbox/Slack |

My delivery window is 48 hours because this work should not drag into a week of uncertainty when you need traffic live now.

• DNS review and correction
• Redirect cleanup
• Subdomain mapping
• Cloudflare configuration
• SSL verification
• Caching setup
• DDoS protection basics
• SPF/DKIM/DMARC setup check
• Production deployment review
• Environment variable audit
• Secrets handling review
• Uptime monitoring setup
• Handover checklist

The practical outcome is simple: your marketplace landing page becomes safe enough for real visitors, real emails, and real campaign spend without obvious security holes holding back launch.

What Good Looks Like Before Traffic Goes Live

I want these thresholds met before you send paid visitors:

• LCP under 2.5 seconds on mobile
• CLS under 0.1
• Zero exposed secrets in frontend bundles
• SPF/DKIM/DMARC all passing for outbound mail
• No critical auth bypasses
• No open admin routes without authentication
• Uptime monitoring active with alerts tested once
• Rollback path documented before release

If you cannot confirm those numbers yourself in under 15 minutes, the launch is not ready yet.

References

• roadmap.sh - Cyber Security Best Practices: https://roadmap.sh/cyber-security
• roadmap.sh - API Security Best Practices: https://roadmap.sh/api-security-best-practices
• roadmap.sh - Code Review Best Practices: https://roadmap.sh/code-review-best-practices
• OWASP Top 10: https://owasp.org/www-project-top-ten/
• Cloudflare Docs - Security Overview: https://developers.cloudflare.com/fundamentals/security/

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Take the next step

If this is a problem in your product right now, here is what to do next:

• [Use the free Cyprian tools](/tools) - estimate cost, score app risk, check launch readiness, or pick the right service sprint.

• [Book a discovery call](/contact) - I will tell you honestly whether you need a sprint or if you can DIY the next step.

*Written by Cyprian Tinashe Aarons - senior full-stack and AI engineer helping founders rescue, launch, automate, and scale AI-built products.*